Power-shovel.



E. J. ARMSTRONG 64 H, ROMIVIERDALE.

POWER SHOVEL.

APPLICATION FILED SEPT. 20. I915.

Patented Sept. 11, 1.917.

steam shovels.

3TATE3 PATENT UFFINE.

EDVIN J. ARMSTRONG AND HOLGER ROMMERDALE, OF ERIE, PENNSYLVANIA, AS-

SIGNORS TO BALL ENGINE COMPANY, OF ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

POWER-SHOVEL.

. Specification of Letters Patent.

To all whom it may concern:

STRONG and Homer: ROMMERDALE, citizens of the United States, residing at Erie, in the county of Erie and State of Pennsylvania, have invented new and useful Improvements in Power-Shovels, of which the following is a specification. y

This invention relates to power shovels and consists in certain improvements in the construction thereof as will be hereinafter fully described and pointed out in the claims.

More particularly the invention relates to a type of steam shovel wherein the digging advances toward the shovel rather than away from it as is the more common practice. By advancing the out toward the shovel, the shovel is carried by the earth in advance of the trench and as this has been ordinarily undisturbed the difficulties of having the shovel on the trench and the advance made away from the shovel are obviated. In carrying out my invention the instrumentalities used in the ordinary shovel have been used as far as practical.

The invention is illustrated in the accompanying drawings as follows I Figure 1 shows a side elevation of thesition as the dipper is lifted.

1 marks the shovel frame, the wheels on which it is mounted, 3 the turn table, 4: the turning pinion and 5 the gear on the frame which the pinion 4 meshes, 6 the wheels supporting the turn table, 7 the boom, 7 a rod forming .a boom support, 7 a post to which the rod 7 extends and '7 a rod extending from the post to the turn table. These parts are of the ordinary construction used in The dipper stick 8 has the dipper 9 rigidly mounted on the end of it. The shoe or cutting edge 10 of this dipperfaces toward block 20 to a drum 25.

and is driven by the crowding engine 17. The handling of the dipper stick by the operation of the crowding engine and its control follows ordinary practice.

A cover 18 is provided for the dipper. It is pivotally mounted on the dipper by means of the pins 19 and is adapted to close the face 11 of the dipper. A pulley block 20 is secured by a link 21 to the cover 18 at 22. A line 23 extends from the block 20 over the pulleys 24: on. the drum and through the The drum 25 is mounted on the shaft 26 and the shaft 26 is journaled in the engine frame 27. A drum gear 28 is mounted on the shaft 26 and is driven from a drum gear 29. The drum gear 29 is mounted on the shaft 30 and is driven from the hoisting engine 31. The ordinary steam boiler 33 is mounted on the turn table and supplies steam to the engine of the shovel.

A block 34 is connected by links 35 with the arms 37 by means of pins 36. The arm 37 extends from the rear of the cover 18 and forms an opposing lever to the lever formed by the cover around the pivot 19. The line 38 extends from the pulley block 34 over the pulley 39 and through the block 34 and over the drum 10 mounted on the shaft 30.

The drums 25 and 40 are operated from the engine in the usual manner with the usual devices for locking them with and re leasing them from the shafts on which they are mounted (not shown) so as to pull in the lines 38 and 23 and to release the same from tension. It will be observed that the drums 25 and 40 rotate in opposite directions through the action of the intermeshing .ried under the drum 25 and the line 38 over the drum 4.0 so that with the engine running Patented Sept. 11, 1917.

in the same direction both lines can be pulled in at the same time,

In the operation of the device, the dipper stick is lowered into the trench A and this is accomplished through the action of the crowding engine acting through the rack 13 on the dipper stick. Tension is then put on the line 23 and this not only holds the cover 18 in an open position but advances the dipper inwardly or toward. the shovel thus through the action of the line 38 and the.

crowding engine and swung. outwardly through the action of the line 38. When the dipper reachesa sufficient elevation to make.

it desirable to open the cover, as for instance a the position shown in Fig. 2, tension is put 'on the line 23, the dipper stick being held outwardly by the crowding engine. The effect of this is to open the cover. This is also accomplished even thohgh equal tension is put on the two lines because the leverage through which the line'23 operates is greater, the distance between the pivot 22 and 19 being greater than the distance betweenthe pivot l9 and the pivot 36. The eflectis to open the'cov r with the shovel in the eleed into the trench in proper-condition for work when tension isagain put on-the. line 23 and the dipper advanced. The operator by controlling the tension on the lines 23 point at which. the

and38 can control the dipper strikes the work.

It will be observed that the shovel is carried bythe earth before it is disturbed and on theoriginal ground level. It makes it possible to dig very narrow trenches where this isdesired without subjecting the walls of the trench to th'e weight of themai 40 chine.

While weuse' the term'a dipper rigidly mounted on the dipper stick we do not wish to-exclude by' this structure a dipper. which is mounted to swing on the dipper stick with r an axis in alinement with the dipper stick.

the cutting face of the dip er ;and means What we claim as new is 1 1. In a power shovel, the combination of'a shovel platform; a boom extending from the platform; a dipperstick sliding'ly mounted 50 on the boom; a dipper on the dipper stick having its cutting edge-extending toward the 7 platform and away from the dipper stick throughout its operation; two lines operating the dipper; a closure for the dipper closing actuated by varying the tension on. said lines and operating upon the closure for releasing on the dipper stick having its cutting edge the material from the dipper.

2. In a power shovel, the combination'of a 6 shovel platform; a boom extendinw from the platform; a dipper stick mounted on the boom; a crowding engine operating on the dipper stick; a dipper rigidly mounted on the dipper stick having its cutting edge ex tending toward the platform; two lines opvated positio shown in Fig. 2 thus com pletely emptying the same. Both lines are. then slacked off and the dipper stick crowd} r erating the dipper; and meansactuated by. varying the tension on said lines in connection with the crowding engine for releasing the material from the dipper.

3. In a power shovel, he combinationof a shovel platform; a boom extending from the platform; a dipper stick mounted on the boom; a crowding engine acting on the dip-.

per stick; a dipper on, the dipper stick having its cuttingledge extending toward the platform; two lines operating the dipper,-

one outwardly and one inwardly; a closure for the dipper for closing the cutting face' thereof; and means actuated by varying the tension on said lines and operating upon said closure for releasing the material from the dipper.

4. In a power shovel, the combination of a shovel platform; a boom extending from the platform; a dipper stick mounted on the boom; a crowding engine operating on the dipper stick; a dipper on the dipper. stick.

havmg its cutting edge extending toward the platform; two lines operating the dipper, one extending to a point on the boom outside the dipper stick and one extending inwardly to a point -on'the boom inwardly from the dipper stick; a closure for the cutting face of the dipper; and means actuated-by varying the relative tension on said lines for actuating said closure for releasing material from the dipper.

5. Ina power shovel, the combination of a shovel platform; a boom extending from I 'theplatform; a dipper stick mounted on the boom; a dipper on the dipper. stick having itscutting edge extending toward the platstick; a closure for the cutting face of the and with said lines and said crowding enform; a crowding engine operating on said j dipper stick; two lines operating thedipper gine for advancing the shovel into the work,

elevating and retracting the shovel and discharging the material therefrom.

6. In a power shovel, the combination of a shovel platform; a boom extending therefrom; a dipper stick mounted on the boom;

a dipper mounted on the dipper stick and having its cutting edge extending toward.

the platform; a cover for the cutting face of the dipper; and meansfor automatically opening and closing the cover as .the dipper 1s. operated.

7 In a power shovel, the combination of a platform; a'boom extending from the plat-' form; a dipper stick on the boom; a dipper the other adapted to close the cover and retract the dipper.

8. In a power shovel, the combination ofa 13b asaeee platform; a boom extending from the platform; a dipper stick mounted on the boom;

advancing the dipper and automatically opening'the cover for closing the cover as the dipper is elevated (int-meted. v i A I 9. In a power shovel, the combination of a latform; a boom extending from the platorm; a dipper stick; a dipper on the dipper stick havin its cutting edge extending toward the p atform; a cover. for the dipper;

two lines extending from the dipper, oneadapted to open the cover and advance the dipper into the work and the other adapted to close the cover and retract the dipper; and means actuated by varying the relative tension on said lines opening the cover to release the material.

10. In a power shovel, the combination of a platform; a boom extending from the platform; a dipper stick mounted on the boom; a dipper mounted on the dipper stick having its cutting edge extending toward the platform; a cover on the dipper; and means for advancing the dipper and automatically opening the cover for closing the cover as the dipper is elevated and retracted and for opening the cover with the dipper in an elevated retracted position.

11. In a power shovel, the combination of a platform; a boom extending from the platform; a dipper stick on the boom; a dipper on the dipper stick having its cutting edge extending toward the platform; a cover pivotally mounted on the dipper for closing the dipper; and two lines for actuating the.

cover extending from the cover,.0ne at one side of the pivot and the other at the oppo-.

site sideof the pivot.

,12. In a power shovel, the combination of a platform; a boom extending from the platform; a dipper stick on the boom; a dipper on the dipper stick having its cutting edge extending toward the platform; a cover pivotally mounted on the dipper for closing the dipper; and two lines extending from the cover from'opposite sides of the pivot, one inwardly and adapted to open the cover and advance the dipper and the other outwardly and adapted to close the cover and retract the dipper.

13. In a power shovel, the combination of a platform; a boom extending from the platform; a dipper stick on the boom; a dipper on the dipper stick having its cutting edge extending toward the platform; a cover pivotally mounted on the dipper for closing the dipper; and two lines extending from the cover at opposite sides of the pivot, one inwardly and adapted to open the cover and advance the dipper and the other outwardly and adapted to close the cover and retract the dipper, the point of attachment of the line extending inwardly being more remote from the cover pivot than the point of attachment of the outwardly extending line.

let. In a power shovel, the combination of a platform; a boom extending from the platform; a, dipper stick mounted on the boom; a crowding engine operating on the dipper stick; a dipper on the dipper stick'having its cutting edge extending toward the platform; a cover pivotally mounted on the dipper and the cover and extending inwardly, said line being adapted to open the cover and advance the dipper; and a second line attached to the cover at the opposite side of its pivot adaptedto close the cover and retract the dipper. q I 1 15. In a'power shovel, the combination of adapted to close the same; aline attached to a platform; a boom extending from the platform; a dipper stick mounted on the boom;

a crowding engine operating on the dipper stick; a dipper on the dipper stick having its cutting edge extending toward the platpivot than the lien extending outwardly.

16. In a power shovel, the combination of a platform; a boom extending therefrom; a dipper stick mounted on the boom; a dipper on the dipper stick having its cutting edge extending toward the platform; a cover pivotally mounted on the dipper for closing the same; two lines extending from the cover, one at each side of the pivot, one extending to a point on the boom outwardly from the dipper stick and one extending inwardly; and a motor for simultaneously moving said lines in the same direction.

17. In a power shovel, the combination of a shovel platform; a boom extending therefrom; a dipper stick mounted on the boom; a dipper mounted on the dipper stick and having. its cutting edge extending toward the platform; a cover for the cutting face of the dipper; and means for automatically openingaud closing the cover.

18. In a power shovel, the combination of a shovel platform; a boom extending therefrom; a dipper stick mounted on the boom; a dipper mounted on the dipper stick'and having its cutting edge extending toward the platform; a cover for the cutting face of the dipper; and means for automatically opening the cover as the dipper is advanced to the work.

19. In a power shovel, the combination of a shovel platform; a boom extending therefrom; a dipper stick mounted on the boom;

a dipper mounted on thedipper stiek and set 0111' hands in the presence of two subhaving its cutting edge extendingftoward scribing witnesses.

the platform; a cm'er for the cutting face EDWIN JQARMSTRONG.

of the dipper; and ineans for automatically HOLGER ROMMERDALE. 5 closing the cover as the dipper is retracted WVitnesses:

from the Work. B. M. HARTMAN,

In testimony whereof we have hereunto THOMAS C. MILLER. 

